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Note 13 - Share-based Compensation (Details Textual)
12 Months Ended
Dec. 31, 2018
USD ($)
$ / shares
shares
Dec. 31, 2017
USD ($)
$ / shares
shares
Dec. 31, 2016
USD ($)
$ / shares
shares
Number Of Active Stock Incentive Plans 1    
Number Of Inactive Stock Option Plans 1    
Common Stock, Capital Shares Reserved for Future Issuance 537,978    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Grants in Period, Net of Forfeitures, Total 0 0 0
Restricted Stock Units and Performance Share Award Target Level, Percentage 100.00%    
Share-based Compensation Arrangement by Share-based Payment Award, Options, Exercises in Period 0 0 0
Director [Member]      
Share-based Goods and Nonemployee Services Transaction, Quantity of Securities Issued 11,172 14,944 27,640
Share-based Compensation Arrangement by Stock-based Payment Award, Grant Date Fair Value | $ / shares $ 21.48 $ 14.72 $ 9.95
Minimum [Member]      
Performance Awards Issued Multiplier 0.00%    
Maximum [Member]      
Performance Awards Issued Multiplier 200.00%    
Employee Stock Option [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 5 years    
Share-based Compensation Arrangement by Share-based Payment Award, Expiration Period 10 years    
Restricted Stock Units (RSUs) [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Award Vesting Period 3 years    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares     $ 9.50
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period 0 0  
Performance Shares [Member]      
Employee Service Share-based Compensation, Nonvested Awards, Compensation Not yet Recognized, Share-based Awards Other than Options | $ $ 0    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares $ 19.97    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period   0 0
Restricted Stock Units and Performance Stock Awards [Member]      
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period, Weighted Average Grant Date Fair Value | $ / shares $ 19.97    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Grants in Period [1] 43,077    
Share-based Compensation Arrangement by Share-based Payment Award, Equity Instruments Other than Options, Vested in Period, Fair Value | $ $ 1,600,000 $ 100,000 $ 100,000
[1] The number of shares disclosed in this table are at the target level of 100%.